Messages in this thread | | | Date | Tue, 7 Mar 2006 21:14:02 +0000 (GMT) | From | Hugh Dickins <> | Subject | Re: How to find all the tasks with a Sys V shm? |
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On Tue, 7 Mar 2006, Kamran Karimi wrote: > > id = ipc_findkey(&shm_ids, key); > shp = shm_lock(id); > ... > > But here we only get the vma of the task that created the shm, and not any > other task who has attached it. > > How can we find all the vma structures that represent a shm?
The simplest example to follow would be reset_vma_truncate_counts() in mm/memory.c: shp->shm_file->f_mapping gives you the struct address_space * mapping to pass to vma_prio_tree_foreach(). Ignore the i_mmap_nonlinear lines, you can't get nonlinear shm (because shm_vm_ops lacks .populate). You'll need to spin_lock(&mapping->i_mmap_lock) first, spin_unlock after.
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